Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of the first image of the display screen or portion thereof with transitional graphical user interface;

FIG. 2 is a front view of the second image of the display screen or portion thereof with transitional graphical user interface;

FIG. 3 is a front view of the third image of the display screen or portion thereof with transitional graphical user interface;

FIG. 4 is a front view of the fourth image of the display screen or portion thereof with transitional graphical user interface;

FIG. 5 is a front view of the fifth image of the display screen or portion thereof with transitional graphical user interface;

FIG. 6 is a front view of the sixth image of the display screen or portion thereof with transitional graphical user interface;

FIG. 7 is a front view of the seventh image of the display screen or portion thereof with transitional graphical user interface;

FIG. 8 is a front view of the eighth image of the display screen or portion thereof with transitional graphical user interface;

FIG. 9 is a front view of the ninth image of the display screen or portion thereof with transitional graphical user interface;

FIG. 10 is a front view of the tenth image of the display screen or portion thereof with transitional graphical user interface;

FIG. 11 is a front view of the eleventh image of the display screen or portion thereof with transitional graphical user interface;

FIG. 12 is a front view of the twelfth image of the display screen or portion thereof with transitional graphical user interface; and,

FIG. 13 is a front view of the thirteenth image of the display screen or portion thereof with transitional graphical user interface.

The appearance of the claimed design transitions sequentially between FIGS. 1 and 13. The process or period in which one image transitions into another forms no part of the claimed design.

The broken line showings of portions of a display screen, text, and other features in the figures are environmental only and form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with transitional graphical user interface, as shown and described. 